Abstract
The cut-off of the La Grande Rivière at the LG2 main dam, 117 km from James Bay, resulted in saline penetrated which advanced regularly for a distance of 31 km between November 27, 1 978 and early April, 1979. After retreating to 6 km from the mouth of the river in May, the saline front rose about 20 km in July and returned to near the mouth in November 1979. The daily catch in mesh nets placed in 6 stations made it possible to follow the movements of three marine fish species (Gadus ogac, Myoxocephalus quadricornis and M. scorpius), seven freshwater species (Acipenser fulvescens, Salvelinus namaycush, Esox lucius, Couesius plumbeus, Catostomus commersoni, Percopsis omiscomaycus and Stizostedion vitreum) and six species which can tolerate quite high salinity (Salvelinus fontinalis, coregonus artedii, Coregonus clupeaformis, Prosopium cylindraceum, Catostomus catostomus and Lota Iota. Movements due to the changes in the salinity and temperature of the water have become superimposed on the natural movements observed before the river was cut off.
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